Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt Control and Sustainment Methods 1

Question 1

What is the primary purpose of a Control Plan in the Control phase of DMAIC?

Accepted Answer

To specify what process variables to monitor, how to measure them, the sampling frequency, and the response if limits are exceeded

Answer

To document the project timeline and team responsibilities

Answer

To summarize the financial savings achieved by the project

Answer

To replace the project charter once improvements are implemented

Question 2

Which type of control chart is most appropriate for tracking the number of defects found in a fixed-size sample?

Accepted Answer

c-chart

Answer

X-bar and R chart

Answer

p-chart

Answer

I-MR chart

Question 3

In Statistical Process Control, a process is said to exhibit 'common cause variation' when:

Accepted Answer

The process shows consistent, random variation within control limits with no non-random patterns

Answer

Data points fall outside the control limits in a random pattern

Answer

Seven consecutive points appear on the same side of the centerline

Answer

The process average suddenly shifts after an equipment change

Question 4

Mistake-proofing (poka-yoke) is most accurately described as:

Accepted Answer

Redesigning the process or equipment so that errors are physically impossible or immediately detected and flagged

Answer

Training employees to double-check their own work before moving to the next step

Answer

Adding a final inspection station at the end of the production line

Answer

Updating the Standard Operating Procedure to include error-prevention reminders

Question 5

When a control chart signals an out-of-control condition, what should the process operator do first?

Accepted Answer

Follow the pre-defined reaction plan documented in the Control Plan

Answer

Immediately stop the process and wait for management approval to restart

Answer

Begin a new DMAIC project to investigate the root cause

Answer

Adjust the control limits to accommodate the variation

Question 6

Which sustainment tool provides a visual, at-a-glance view of key process metrics and their current performance status, allowing teams to quickly identify when results are drifting from targets?

Accepted Answer

Performance dashboard or scorecard

Answer

SIPOC diagram

Answer

Cause-and-effect matrix

Answer

Value stream map